package com.rz.htk.print.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import sun.misc.BASE64Encoder;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Hashtable;

/**
 * author: Rui.Zhou
 * date: 2019-09-08
 * Description:
 */
public class QrCodeUtil {
    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private QrCodeUtil() {
    }

    /**
     * 生成二维码
     *
     * @param content
     * @return
     * @throws Exception
     */
    public static InputStream createQrcodeImage(String content) throws Exception {
        int width = 150; // 二维码图片宽度
        int height = 35; // 二维码图片高度
        Hashtable<EncodeHintType, String> hints = new Hashtable<>();
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); // 内容所使用字符集编码
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content,
                BarcodeFormat.CODE_128, width, height, hints);
        BufferedImage image = toBufferedImage(bitMatrix);
        InputStream is = toInputStream(image);
        return is;

    }

    /**
     * @return
     * @Description: 根据图片地址转换为base64编码字符串
     * @Author:
     * @CreateTime:
     */
    public static String getImageStr(InputStream inputStream) {
        byte[] data = null;
        try {
            data = new byte[inputStream.available()];
            inputStream.read(data);
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 加密
        BASE64Encoder encoder = new BASE64Encoder();
        return "data:image/jpg;base64," + encoder.encode(data);
    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }

    public static InputStream toInputStream(BufferedImage image) throws Exception {
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", os);
        InputStream is = new ByteArrayInputStream(os.toByteArray());
        return is;
    }

    public static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format "
                    + format + " to " + file);
        }
    }

    public static void writeToStream(BitMatrix matrix, String format,
                                     OutputStream stream) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }

}